<template>
  <h1>一个人的信息</h1>
  姓：<input type="text" v-model="person.firstName">
  <br>
  名：<input type="text" v-model="person.lastName">
  <br>
  <!--  <span>全名：{{ fullName }}</span>-->
  <span>全名：{{ person.fullName }}</span><br>

  全名：<input type="text" v-model="person.fullName">
</template>

<script>
import {reactive, computed} from "vue";

export default {
  name: "Demo",
  // vue2中的计算属性
  // computed: {
  //   fullName() {
  //     return this.person.firstName + "  -  " + this.person.lastName
  //   }
  // },
  setup() {
    let person = reactive({
      firstName: '张',
      lastName: '三'
    })

    //计算属性-简写(没有考虑计算属性被修改的情况）
    // person.fullName = computed(() => {
    //   return person.firstName + '  -  ' + person.lastName
    // })

    //计算属性-完整
    person.fullName = computed({
      get() {
        return person.firstName + '-' + person.lastName
      },
      set(value) {
        const nameArr = value.split('-')
        person.firstName = nameArr[0]
        person.lastName = nameArr[1]
      }
    })


    return {
      person
    }
  }
}
</script>
